Pointing the camera downward (to avoid sky lights) is not good idea in a car because of the dashboard being visible in the image. Pointing 20 degrees upward does resolve and does give good exposure in good lighting conditions. At least for some or even most pictures.Bicycle is always aiming straight forward and (almost?) always oké. Is there a difference between bicycle and car?

Image frequency might be relevant.Car speed might be relevant. Changing conditions are a culprit.Bicycle (1 image / second) and Foot sequences (1 images / 2 seconds) are oké if (...) light conditions are oké.But also: bicycle images are more often correct than foot images. Shaking head during hiking effects exposure?Bicycle images become blurred in low light conditions. Even at a speed of 15 km/h.

Constrast seems like an issue.If there is a (small) high light somewhere in the images, the complete images may be too dark.

Overexposure contains more information in a photo and is therefore preferred over underexposure.